* {
    margin: 0;
    padding: 0;
}

ul,
ol,
li {
    list-style: none;
}

a,
a:active,
a:hover,
a:link {
    text-decoration: none;
    color: #333;
}

input ,button,section,textarea{
    outline: none;
}
img{
    width: 100%;
    height: 100%;
    display: block;
}
/* 头部样式 */
.header {
    width: 1200px;
    height: 60px;
    background-color: skyblue;
    margin: 0 auto;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    font-weight: 700;
    color: white;
}
.header>p{
   position: absolute;
   top: 50%;
   transform: translateY(-50%); 
   right: 30px;
   font-size: 20px;
   display: none;
}
.header>p.active{
    display: block;
}